Popsugar Entertainment Halloween Downton Abbey Halloween Costume Ideas 15 Proper Downton Abbey Costumes You Can Wear This Halloween October 26, 2019 by Kelsie Gibson View On One Page Photo 9 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Lady Mary Crawley What to wear: A flapper dress, layered necklaces, long gloves, and a short bob wig with bangs. Previous Next Start Slideshow HalloweenDownton AbbeyHalloween CostumesHalloween Costumes 2019TVMovies